Improvement in saw-teeth



N diritta tatea @met catflirt.

anonce LQHILES, orcHroA-eo, ILLINOIS.

Letters Patent No. 103,045, dated May 17, l1870r IMPROVEMENT IN SAW-Tema.

The Schedule rferxed to in Vt'hese Letters Patent and making part of the same,

To whom itmay concern:` y f i Be it known that Lr-Gnoncn L. HILEs, of Chicago,

` in the county of Cook and State of Illinois, have invented4 a new and useful Improvement in MovabletoothedSaws; andldo declare that the following is a true and accurate description thereof, reference be l `mg had to the accompanying drawings andfto the letters'l of reference marked thereon, and being a part of l this speclication, in wbicl1 'V Figure V1 1s an elevation'ot a section of a saw-plate i withfthe tooth inserted;v v

vFigure 2 is ai'ertical transverse section on the line x x 1n iig. 1, showing the outline of the base of' the i toot-l1 and the recess in `the'plate; and vFigure 3 is a horizontal section on the liney y in Similar letters of reference .indicate correspomling parts in each figure. Y

-v The nature of iny'invention relates to an improvement in the cnstructionof niovable szm'teeth and method of securing them to thesaw-plate. It consists in the peculiar conformation ot' the tooth and a corresponding recess in the saw-plate, as more fully hereinafter set forth.

In the drawings--Y Y Aa'cprescntsa saw-plate, having formed .in its edge or periphery, at properintervals apart, the inclined or beveled vrecesses A', for the purpose of more securely holding the-tooth therein. The edges of the recess are haltdqvetailed, as shown `in tig.

-B is a tooth of any approved form, having a base,

B', formed to enter andV accurately fit the recess A', r where 1t 1s held by the machine screws a, countersuuk in and passing through tooth and plate. They may.

" be either halved iny at the edges of the tooth, or insorted through its body. rlhe back part of the tooth is f 'ormed `with-a shoulder, l), which rests against the sohd plate atthe point where the greatest strain is exerted thereon;

The recesses A arc not sockets lnthe periphery of the saw, where the metalof the plate is cut entirely v away forthe reception ofthe tooth, asin inserted tooth-saws `of the styles heretofore made, but are made in the side ofthe plat-e, and nearly'parallel therewith, and maybe more or less inclined as they approach the periphery ot' the plate, or, if preferred,

they may be' parallel, and the bases halved Z in.

. Sawshavi'ng teeth inserted therein or secured thereofnthe 4'teeth to in themanner described, may, with great advantage to their cutting capacity, have their teeth set,. in-

steadotfY ewa-ging their points to give them clearance, especially in sawing soft timber.

and the teeth inserted on alternate slides.

1t is well known that the chief strain on a circular saw, when at work, is onits periphery, and by cutting l sockets in it for the'reception of teeth, as in the manner heretofore practiced, itis very materially'weakcned, whlein the formation of the recesses, in the manner above described, the strength of the plate is almost unimpaired. In striking a hard foreign sub-v stance in the timber being sawn, the fracture, should any occur, will happen to the tooth, which can be readily replaced at a small cost.

The use of screws in the place of rivets, in vogue,

is equally advantageous, as, unless the rivets are `inserted with the greatestv care by a practiced hand, they will strain the' plate so as'to induce an easy fracture, or the teeth will not be well secured in position, while the screws may be inserted by any one without endangering the safety of the plate.'

lhis method of inserting 'the teeth is equally applicable to reciprocating as to circular saws.

If desired, the shoulder b of the tooth, and that` part of the plate in contact with it, maybe tonguedand grooved together.v

What I claim as my invent-ion, and desire to secure by Letters Patent, is-

1. The recesses A in the same or alternate sides of the peripheries thcreof,for the reception of movable teeth, substantially as described;

2. In combination with the recesses A', the mova- Y:

ble teeth B, provided with bases B', corresponding in form with said recesses, and secured therein, substantially as described, for the purpose ,set forth.

GEORGE L. HILES. IVitncsses:

H. F. Ennn'rs, SAML. B. l Bann.

lhe set of the teeth will 'be better obtained if the plate be recessed 

